[issue22515] Implement partial order on Counter

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

At least this condition is false for current implementation:

(a < b and b < a) == False

Example: a = Counter({'a': -1}), b = Counter({'b': -1}).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22515>
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